Convert MBOX to PST
Only use the SysInspire Thunderbird converter programme if you need to move Thunderbird emails to Gmail. It is the safest software for converting many or single Thunderbird emails to Gmail files without affecting email formatting, styles, fonts, or email headers. It may export MBOX files in a variety of formats, including EML, EMLX, Yahoo, Office 365, GMAIL, MSG, and HTML. It can also provide free trials in which customers can transfer up to 25 Thunderbird items to other formats.
Read More:- https://www.sysinspire.com/mboxconverter/

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Kiran Sharma commented
MacSonik MBOX converter tool is a reliable utility to convert MBOX to PST file format. This utility supports different MBOX file formats like MBS, MSF, and MBX and provides secure bulk conversion of them. During the conversion process, it keeps folder hierarchy and data security intact. The MBOX converter also enables converting/migrating MBOX files to 20+ file formats and email clients. Its simple interface makes it easy to use i.e, users do not need any technical assistance to use this tool.
To know more- https://www.macsonik.com/mbox/converter/